Apparatus for feeding pulverized fuel.



V. Z. CARAGRIS'I'. APPARATUS Por; FBBDING rubvh 'zP'D FUEL.

APPLICATION FILED MM' 25, lill,

VIENI-dill KUS El.

CARACRISTI, F ALBANY, NEW YORK.

AWIEJRATUS FOR FEEDING PULVERIZEID FUEL.

Application filed 'Muy 25, 1914.

To all renom 'it only armen/"1.a:

.lle it known thiit l., tlnunxuih l5. (lmerenrri, e Citizen el the United ,States of :init-rien, null rt ident olf' Mhuny, in the rounty o'l" fillmny :nel lltute of New York', here invented eertriio new :nifl nselul l1nprmfenmnte in Alppergilnefor Feeding Pnlrerifeil linel, o'lwhich the following isn peel l lotion" i of this` invention to provide un impro-:itin: wherehj/ pnlverized fuel, such ne line eozil commonly celled breeze, or other iimteriul of like powdered nature, muy be utlvuntngernzsly neil thormighly mixed with the quantity elf air required for the eomhnetion of the Sinne, :nul the mixture (leliiferel in forni euitahle For use ne fuel for ell these ourpoeee lor .rliieh pulrerizeil fuel if; fieleptyh .For Lhii-i purpo:-e Iueerns nre prevhilefl tout prinluee i liellow eylirulriesil etreinn or enreli'ip ol :iir :il hoth the onleirle unil the ins' 4 .i olE which the pulverizeil fuel i lied, ssii" iuel heine: teken up b v the etre-im el fr in its pf'ienzagfe toward the nozroin whieli both ure fflelivered. in the Heroinpzniving ilren'il'ng, llieure 1 is n, wwwtiritl longitudinal seetiim ol: :in appie hoog/ini; the invention, nml Fig. 2

retire rm is; :i re'tierlil llrumsrersij- :wehen on, line lm-Q, rig.

lrlimilur ii :l'ere1iee numeralsv indicate eer-- "inline perte-i in heath ih nree.

ihr to l-figif. l, the nppuretns eenen-leefl ng enpporlrrl in enr suitable nmnner, unil eonei'tlrel ol u liront portion lll und u rertirnl i fir-portion or l'nel-hox ll ronniwterltl'irrrwillr Within this fronte-poi"- tion il) is nrreinrecl :i hollow rotary return :Iierew l2, .Quill return sieren' lil-ing mounteil in the resine; un shown :it l, ll. s-:o ne to rotute freeljj, therein. n epm-e lll heine' lefl' free lo prerenl umieeewirfi" lfrh'tiolh W'ilihin eeiil hollow return Screw lf3 is loenterl the :in'nnlnr n "rile l?) ol" en nir supply-pipe lll whiei is :1. .intimi :il: the rrnr ol" the rinsing); l0. lili'iihin the hollow nozzle l-"i nl lornleil n 'liue'l l'eeul-:\:rre\\ ll'. .The lrwl--seree' is ilriien hr gran- :inil pinion ronnerliom` lo :intl lil, Elli .inil til. l'ronr nn elerl'rir motor 2; or other euilnlilr sonrrr ol' power. ,\l` llul lo'eer puri.' nlA llulporlion lll ifi nionnlril :i @hull i213, whirl: ferriees the pinion ll", 1*nhl shnlt :also riirrieri n pinion ',lwhirl! :nef-'lieQ will; teeth EJB fil the 'loiniirilrnil nl" the rrlnrn screw l?. The tlinnirter oll nhl pinion Epecifieatiun of Letters Patent.

ferr-ine; to the (li-owing, enil more pur- Intented Nov. 24, 1914. Serial No. 840,842.

lll und the geur 18, und the dimneter of Seid pinion :el :nul the gearing are substantiully the sume, hut muy he ehunged depending; noon the various relative speeds desired to he given to the purtr.l Hence, the return screw 12 nnil the le(:tl+;i:1ew 17 are driven in the sume direction, ns is eleer from on examination of Fig. l. A nozzle 2G is connected with the ei'ieing l0, muil extends ove' nnrl closes the 'forward end of the Ieturn screw l2. '.lo the discharge end of the nozzle 26 .is connected n pipe :4T for enr-ryng ell' the mixed fuel. A rmeking 28, be tween the return screw :incl the (,nsing 10, renders the eonneotirm between these parts tight :it that point. A spring-actuated washer 2l) between the nozzle QG and the return screw l makes i1 tight connection et the forwurilfenfl ofthe return screw.

The ),nilrerized cool is fed through e. supply-pipe or hopper 30 into the fuel-box 11, whieh hue :in inclined guide 'ull 30, and the luel tulle` in eontnet with the feedserew 17, which extends through the lower pnrt of the hopper or 'fueLbox 30. The sei-ew 1T luis itsilisehnrge end in proximity to the (lisehnrge enfl ol the nir nozzle 15, unil the nir nozzle 15 is :arranged around the (lisehnrge eniil ol the 'feed screw. The nir nozzle l5 ii; loenleil nt :i eoneidernble clistnnre Imrk lrom the outer end of the return serew lil, :is Shown in Ithe drawing, and nppriminnitely on the vertixul plune ol the tip of nifl :iir nozzle. Huid return Screw begins to eonlruet towuril the mnin nozzle 2G of the nppurulus; with whieh the inner wallsui-lures' of Hohl return sei-ew Ylornl prnelir'nlllr :1 eontinuulion, the nozzle 26 being enlnreml :it its4 inner portion il? so :1S to meet the eontreu'teil portion l :it the outer end olf the return errore 'l'he helienl ril) 31 is eonlinneil. homely. hevoml the (leliver ,'-enil of the uironzz/,le 15. 'There is therel'iy 'formed in tlul'orwnril portion ol7 the ret-urn screw* :inrl the enlnrn'eil portion ol the moin nozzle ill?. :i were whirl: is userl :le u mixing space, in whii-h :he l'nel is l'eil h v the nir nozzle, ille .wriiil rolunni oll nir isiuing from the nir nozzle l. In the emhmliment lshown in the ilrnwinn' thel rolumn ol nir is e vlin lrieol :inrl hollow, ln the went el :my ilillieulty in '-:ifr'inpif ilu' nir-nozzle in; Shown in the emlmlinunl :shown in the tlruwingfunil ifit il; (Ii-ireil for elrnrturul reasons lo put any insertions in the nir nozzle. it muy he that lhe-:n Inger-lioneA will imperio eonueu'hut the 'their that of the enlarged rear portion of said nozzle. vThe result of this constructioi'i is that the streaiu or envelop of oir now corrying fuel strikes against the rear portion of the nozzle 2li :and is deflected thereby, and the stream continu-.ted to a reduced diameter, the particles of fuel carried by the same being deflected toward the center of the stream, and a mixture of uniform. density,

Y and having increased lineal speed over that of the air discharged from the air nozzle 15,

is lproduced :ind discharged through the mouth. 37 of the mein nozzle 2'?.

The pitch of the screw 'is opposite to that of the return screw l2, and the feed screw l feeds the fuel forwardly, discharging it :it the end 17a. it is discharged, the fuel is continually enveloped by the en* volop of nir discharged lfrom the nozzle 15 at l5-. As the fuel drops, portions of it are carried foi-ward, and are delivered into the `niouth 37, all the time being commingled with air. @ther portions which are not conveyed by the first action of the air stream, drop by gravity into the spaces 31a., 3l, 31, and by so dropping, pass through the en-` velop of air, andere thus intimately mixed with the air. As so mixed, they drop on to the return screw l2, and are conveyed in a rotary .direction by the rotation of the return screw. l/Yhen it reaches a point Where it is free to drop away from the return screw l2, it .falls downl again on 'to the outer portion ofthe envelop, and through. the envelop of air, and then again commingles with the incoming fuel, and at the same time that portion not conveyedA by the air stream. from the air nozzle to the mouth. 37, drops through the lower portion of the envelop of air, and again on to the Wall of the return sereni', probably into the spaces 3l", 31, 31, and also into a portion closer to the nozzle. A certain portion,

horrores', of this airenreloped fuel, which was conveyed upwardly by the return screw, is conveyed ley the stream outwardly to the nozzle 27. As this action is repeated, the fuel in the mixing chamber, formed by the outer portion of the return screw, theend of the air nozzle, and the discharge 'of the feed screw, is reeurrently brought into contact with the air, and thereby a thorough. intermixing; of the fuel and air taires place.

' Certain portions of this fuel which are not 'fed forwardly into the mouth 37 and nozzle 27, are conveyed rearwardly by the return screw 12 into. the space'lQL1 beyond the action of the air column, and are then'carried ruscellby the rotary action ofthe return screw, and conveyed rearwardly to the space 3l, which is formed by the rear end of the return screw, the rear end. of the air nozzle, the feed screw, and by thedelecting plate 13a. Here the fuel has :inV opportunity of again being carried forward by the fuel feed screw ll', and may then he again subjected to the operation of the air envelop as described. l/'Vliatever surplus fuel is 'not fed by the screw if? forwardly, posses through the space 30, into the feed hopper ll.. lt may` then be fed bythe feed screw li as the action may require. ln event of a failure of the air blast issuing from the nozzle, the

return screw will return all the fuel thereby preventing' :i choking at the mouth 37.

in the embodiment shown in Fig. 1, the nozzle has been shown to have its discharge end substantially in Vline with the discharge end of the feed screw, but it is clear 'that changes may be mede herein, in that the feed screw may extend beyond the discharge end of 'the nozzle l5, or the nozzle may ter-- iniziate somewhat rearwardly ofthe posin tion shown in Fig. l.

The apparatus described produces eed nomic-.ally a fuel mixture extremely rich .in the elements of combustion. By reason of the hollow stream of air and 'the supply of fuel, the recurrent mixing of the ements is thoroughly accomplished.

`@ne embodiment of the invention has heen described, but it is obvious that changes may be made 'therein 'Without departing from the spirit of the invention as set forth in the claims, especially in so far as relates to any of the mechanical features which have been described and enter into en operative device.

I claim:

l. An apparatus for feeding pulieiizei'l Cia lll@

nozzle for recurrently feeding to the column of air the fuel., and returning certain portions of the fuel to the feeding element.

2. An apparatus for feeding pnlverized fuel, comprising a feed screw for supply ing fuel, an air nozzle arranged around the feed screw at the discharge end thereof, a return screw arranged around the feed screw and the air nozzle, and extending forwardly of the feed screw and air nozzle, formino' a mixing chamber at the frontcf the feed screw and air nozzle. E'

3. An apparatus for feeding pulverized fuel, comprising a feed screw for supplying fliehen air nozzle arranged around the feed screw at the discharge 'end thereof, a return screw arranged around the feed screw and the feed screw and air nozzle, 4ormin a as my invention, I have signed my n-.mie in mixing ciamber atl the gromt:f of1 tlllle ed presence of two subscribing Witnesses. screw an zur nozz e, an a ue c :un er f o a't the rear of the air nozzle and return VIRGINIUS CARACRlS'lI 5 screw and adjacent the feeding portion of Witnesses:

the feed screw. C. E. FLODIEU,

ntestimony, that I claim the foregoing EMILY L. MYERS. 

